You control Terry as you would any other game character, but the feel is that you are not actually playing as terry, but as an outside controlling terry.
The game is fun. It has a Final Fantasy 2 level up system, fight to get stronger, get hit to increase hp. And you can't just keep using healing items carte blanche, you have a digestive system that can only hold so much, and each item has it's own time limit before it is digested. some like herbs only fill up a little bit and last for a short period of time, but like cheeseburgers take a couple minutes.